Muwatta Malik, Book 5, Hadith 23 (USC-MSA)

Yahya related to me from Malik from Jafar ibn Muhammad from his father that the Messenger of Allah, may Allah bless him and grant him peace, gave two khutbas on the day of jumua and sat down between them.

وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ جَعْفَرِ بْنِ مُحَمَّدٍ، عَنْ أَبِيهِ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم خَطَبَ خُطْبَتَيْنِ يَوْمَ الْجُمُعَةِ وَجَلَسَ بَيْنَهُمَا ‏.‏

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also referenced under: Book 5, Hadith 246 (In-Book)